(n.) Anything peculiar to a foreign language or people; a foreign idiom or custom.

Gothicism Irish bull Neanderthalism age of ignorance animality antiphrasis bad taste barbarity barbarousness benightedness benightment bestiality bombasticness brutality brutishness cacology cacophony clumsiness coarseness colloquialism corruption crudeness cumbrousness dark dark age darkness dysphemism error foreignism gracelessness grossness harshness heathenism heaviness ill breeding ill-balanced sentences impoliteness impropriety impurity incivility inconcinnity incorrectness indecorousness inelegance inelegancy infelicity lack of finish lack of polish lapse leadenness localism malaprop malapropism misconstruction missaying misusage misuse neologism paganism philistinism pompousness ponderousness poor diction roughness rudeness savagery savagism sesquipedalianism sesquipedality shibboleth slang slip slipshod construction solecism spoonerism stiltedness taboo word tastelessness troglodytism turgidity uncivilizedness uncouthness uncultivatedness uncultivation unculturedness unenlightenment uneuphoniousness ungracefulness ungrammaticism unrefinement unseemliness unwieldiness vernacularism vulgarism vulgarity wildness